Yazar "Danisman, Y." seçeneğine göre listele

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    PC Spectra Analysis of L-Shell Copper X-Pinch Plasma Produced by the Compact Generator of Ecole Polytechnique
    (Amer Inst Physics, 2017) Yilmaz, M. F.; Danisman, Y.; Larour, J.; Aranchuk, L. E.
    Principal Component Analysis (PCA) is applied and compared with the line ratios of special Ne-like transitions for investigating the electron beam effects on the L-shell Cu synthetic spectra. The Principal Components (PC) of L-shell Cu are extracted over a non-LTE collisional radiative L-shell Cu model with and without presence of hot electrons to discuss the electron beam effects. Furthermore, PC spectra of Ne-like transitions are also studied as an alternative diagnostics to investigate the polarization sensitivity of these transtions. The extracted PCs are used to estimate the plasma electron temperature, density and beam fractions from a representative time-integrated spatially resolved L-shell Cu X-pinch plasma spectrum. The experimental spectrum is produced by the explosion of 25-mu m Cu wires on a compact L-C (40 kV, 200 kA, 200 ns) generator. The modeled plasma electron temperatures are about T-e-125eV and n(e)=5x10(19) cm(-3) in the presence of the fraction of the beams with f similar to 0.05 and centered energy of similar to 10 keV.
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    Principal component analysis of electron beams generated in K-shell aluminum X-pinch plasma produced by a compact LC-generator
    (Elsevier Science Bv, 2015) Yilmaz, M. F.; Danisman, Y.; Larour, J.; Aranchuk, L.
    Principal component analysis (PCA) method is applied and compared with the line ratios of H-like and He-like transitions, in order to investigate the effects of electron beam on the K-shell Aluminum synthetic spectra. It is also used as a diagnostics to estimate the plasma parameters of K-shell Al X-pinch plasma spectrum. This spectrum is produced by the explosion of two 25-mu m Al wires on a compact LC (40 kV, 200 kA) generator. The database for the principal component extraction is created over a previously developed, non-LTE, collisional radiative K-shell Aluminum model. As a result, PCA shows an agreement with the line ratios which are sensitive to plasma electron temperatures, densities and beam fractions. Principal component analysis also illustrates that the addition to the non-LTE model of a fraction f of electrons in an energetic beam, generates the clusters in a three dimensional vector space which are translations of each other and follows reverse v-shaped cascade trajectories, except for the f = 0.0 case. Modeling of a typical shot by PCA gives the plasma electron temperature of T-e = 100 eV, density of N-e = 1 x 10(20) cm(-3) and hot electron fraction of f = 0.2 (with a beam energy centered at 10 keV). (C) 2015 Elsevier B.V. All rights reserved.